This article lists the United States of America's military dead, wounded, and missing person totals for wars and major deployments.
Wars ranked by total number of American military deaths
"Deaths per day" is the total number of Americans killed in military service, divided by the number of days between the dates of the commencement and end of hostilities. "Deaths per population" is the total number of deaths in military service, divided by the U.S. population of the year indicated.
References
United States military casualties of war Wikipedia(Text) CC BY-SA